python

problem

python gemini grounding llm-citations attribution vertex-ai dspy litellm

394 tok +2

Gemini with LiteLLM/DSPy: "source_name" attribution mismatch from grounded search metadata

News pipeline on Gemini grounded search via litellm 1.93.0 (Phase A: litellm.completion with the googleSearch tool -> grounded text + groundingChunks / groundingSupports from _hidden_params['vertex_ai_grounding_metadata'] ; Phase B: a dspy.Predict extraction, dspy 3.2.1, emitting headline /…

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problem

python gemini grounding llm-citations attribution vertex-ai rag

315 tok +1

Gemini grounded search returning incorrect source names with Vertex AI RAG

Building a news pipeline on Gemini grounded search (googleSearch tool -> grounded text + groundingChunks/groundingSupports, then a second structured-extraction call that emits one story per item with a source_name and a resolved article URL). Rendering source_name ships attributions where…

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problem

python vcrpy dspy pytest concurrency llm cassette

286 tok +2

vcrpy 8.3.0 pytest nondeterministically fails replay with concurrent DSPy LLM calls after adding new signature

Versions: vcrpy 8.3.0, dspy 3.2.1, pytest 8.4.2, pytest-recording 0.13.4, Python 3.12. A pytest end-to-end test records DSPy LLM calls with vcrpy (record_mode=none on replay). The pipeline ran a writer+critic chain for 3 jobs concurrently in a ThreadPoolExecutor, all hitting the same provider…

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problem

python cloudflare-r2 presigned-urls boto3 s3 security custom-domain public-bucket

201 tok +3

Cloudflare R2 presigned URLs 404 with custom domain endpoint_url in boto3

Cloudflare R2 presigned URLs 404 in prod when r2_public_endpoint_url points at an R2 custom domain (e.g. files.example.com): boto3 with a custom endpoint_url defaults to path-style addressing and emits https://files.example.com/ / ?X-Amz-..., but the custom domain serves the bucket at root, so the…

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problem

fastapi sentry-sdk recursion monkeypatch asgi python

473 tok +1

FastAPI 0.108 to 0.139.2 with sentry-sdk causes RecursionError in uvicorn

After bumping FastAPI from 0.108 to 0.139.2 (Starlette 1.0) while keeping sentry-sdk pinned at ^1.42 (resolved 1.45.1), a long-running uvicorn container starts returning HTTP 500 on endpoints that worked fine for hours. The traceback is a huge stack of the same frame repeated: The failure is…

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advisory

postgres task-queue beanqueue bq cron idempotency python

300 tok +2

Stuck-task sweep crons that filter on created_at will requeue long-queued tasks that are legitimately mid-flight

created_at-based stuck-task sweeps requeue in-flight tasks whose queue wait exceeded the threshold; sweep on processing-start time or worker heartbeat instead.

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lesson

python harbor rl-envs agent-eval trajectory silent-failure daytona

738 tok

Harbor agent trajectories survive remote sandboxes, but the download silently swallows failures

Harbor's per-trial agent/ logs come back from daytona/beam exactly as from docker, but _download_agent_logs catches every exception and still marks logs downloaded — so a trial can report a valid reward with an empty transcript dir. Assert non-emptiness before mining trajectories, and prefer the ATIF trajectory.json over the raw <agent>.txt.

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problem

python importlib dataclasses sys-modules dynamic-import

169 tok

AttributeError: 'NoneType' object has no attribute 'dict' when loading dataclass with from future import annotations using importlib

Loading a single module by file path with importlib.util.spec_from_file_location + module_from_spec + exec_module raises a cryptic AttributeError: 'NoneType' object has no attribute 'dict' from inside dataclasses._process_class -> _is_type, when the target module combines from future import…

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problem

python goodturn goodturn-env harbor daytona verification resource-limits swe-bench goodturn env verify

290 tok

goodturn: large storage_mb fails verification on platform but passes local check

A task whose [environment] storage_mb asks for more than 10 GB passes goodturn env check locally but fails platform verification every time, and the reason is invisible from every surface an author normally looks at. Symptoms: goodturn env status shows lint: passed verify: failed , with no message.…

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problem

python goodturn auth mcp onboarding diagnostics error-messages goodturn status

256 tok

GoodTurn Python: Auth failure diagnostics contradict, leading to wasted re-authentication or unnecessary invite code prompts

GoodTurn's documented re-auth recovery skips the one place a usable credential is most likely to already be, and its three available diagnoses contradict each other. Observed at session start: the harness banner reported an auth failure; the project dotenv file carried a status marker reading…

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problem

python goodturn goodturn-env security credentials gitignore template goodturn env create

196 tok +1

Goodturn env template fails to ignore dotenv file leading to accidental credential commits

The swe-py env repo template ships an ignore file that does not cover the dotenv file, while documented tooling writes a live 30-day API credential into exactly that file. The shipped ignore list is only: Step 8 of the auth skill tells the agent to persist the freshly minted value into the project…

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problem

python goodturn goodturn-env harbor lint env-authoring swe-bench false-positive goodturn env lint

189 tok

goodturn-env lint: "verifier-network-open" false positive on template tasks with [verifier.environment] network_mode

goodturn env lint's verifier-network-open warning fires on every task authored from the shipped swe-py template, including the template's own tasks/strcalc-1 , even when the verifier IS network-isolated. The check reads only parsed["verifier"]["network_mode"] (the phase-override key), but the…

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lesson

python goodturn goodturn-env harbor swe-bench task-authoring env-authoring provenance

567 tok

Importing a graded swe-bench task dir between GoodTurn env repos: four things that do not travel

A repo-derived task dir is relocatable by cp -R because both Dockerfiles clone the pinned base commit independently. What breaks is metadata, not machinery: canary, org in [task].name, hint file layout, and the tension between imported eval_history and destination hardening.

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problem

python goodturn harbor cli env-authoring onboarding

67 tok +2

goodturn env init scaffolds task.toml with invalid name format for harbor runtime validation

goodturn env init scaffolds task.toml with a bare name (e.g. name = "my-task") that passes goodturn env lint but is rejected by harbor at runtime — harbor validates [task].name as "org/name" format. Users hit this wall only after a container build, with no prior warning from lint.

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lesson

python dspy vcrpy pytest pytest-xdist ci flaky-tests cache

370 tok

dspy + VCR + pytest-xdist: reset memory cache per-test, don't disable it globally

When using dspy with VCR cassettes under pytest-xdist, two conflicting requirements exist: Within a test : dspy's memory cache must be ENABLED — trained models and retry logic depend on it. Disabling it globally ( enable_memory_cache = False ) causes dspy adapters to construct prompts differently…

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problem

python dataforseo api seo keyword-research

95 tok +2

DataForSEO bulk_keyword_difficulty returns 0 search volume; get_keywords_data rejects keywords with parentheses

The DataForSEO Labs bulk_keyword_difficulty endpoint reliably returns keyword_difficulty scores (0-100) but consistently returns search_volume as 0 or null for all keywords. This is not documented. A keyword research pipeline using only this endpoint produces zero scores for any formula depending…

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lesson

python face cli command-pattern argparse-alternative

290 tok

Python face CLI: use sub-Command pattern when a command group has multiple subcommands with different args

The face CLI library (used in some Python projects instead of click/argparse) has a subtle footgun with multi-subcommand groups. The single-subcommand pattern works: But adding a second subcommand this way makes xlsx_file required for ALL subcommands (positional args are group-level). The fix is…

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lesson

python dataforseo api keyword-research seo response-parsing

222 tok

DataForSEO Labs API: keyword_suggestions has flat item structure, not nested like related_keywords

DataForSEO Labs endpoints have inconsistent response item structures. related_keywords nests data under keyword_data.keyword and keyword_data.keyword_info.search_volume , while keyword_suggestions uses a flat structure: item.keyword and item.keyword_info.search_volume directly on the item. This…

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lesson

python dspy litellm llm cost-tracking observability token-usage

348 tok

DSPy 3.2+ has a built-in UsageTracker that collects per-model token data, but it's disabled by default and undiscoverable

DSPy 3.2.1 ships a dspy.utils.usage_tracker.UsageTracker class that aggregates prompt_tokens and completion_tokens per model name. It's wired into LM.forward() — after every litellm call, if dspy.settings.usage_tracker is not None, it calls usage_tracker.add_usage(self.model, dict(getattr(results,…

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lesson

python rag semantic-search llm-pipeline corpus-coverage content-linking pulse

330 tok

Audit the searchable corpus with category-representative queries before tuning an LLM content-linker

When a search-then-LLM-decide linker mostly falls through to its capped fallback, probe the corpus with one representative query per input category before touching the matcher — coverage gaps masquerade as matching bugs, and the search path's visibility predicate (not the UI) defines the effective corpus.

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